Come together with Array starting from the specified startIndex and ending at the

Question

Come together with Array starting from the specified startIndex and ending at the

I'm curious to know if there is a utility function available that allows for joining arrays while also providing an index. Perhaps Prototype or jQuery already have this feature, but if not, I am willing to create it myself :)

What I envision is something like

var array= ["a", "b", "c", "d"];
function Array.prototype.join(seperator [, startIndex, endIndex]){
  // code
}

so that array.join("-", 1, 2) would result in "b-c"

Does anyone know of a similar utility function within a commonly used JavaScript Library?

Best regards,
globalworming

javascript arrays join indexing

Answer 1

Answer №1

It functions in a natural way

["p", "q", "r", "s"].slice(1,3).join("-") //q-r

If you desire it to operate according to your specifications, you can utilize it like this:

Array.prototype.myConcat = function(separator, start, end){
    if(!start) start = 0;
    if(!end) end = this.length - 1;
    end++;
    return this.slice(start,end).join(separator);
};

var letters = ["p", "q", "r", "s"];
letters.myJoin("-",2,3)  //r-s
letters.myJoin("-") //p-q-r-s
letters.myJoin("-",1) //q-r-s

Answer 2

It functions in a natural way

["p", "q", "r", "s"].slice(1,3).join("-") //q-r

If you desire it to operate according to your specifications, you can utilize it like this:

Array.prototype.myConcat = function(separator, start, end){
    if(!start) start = 0;
    if(!end) end = this.length - 1;
    end++;
    return this.slice(start,end).join(separator);
};

var letters = ["p", "q", "r", "s"];
letters.myJoin("-",2,3)  //r-s
letters.myJoin("-") //p-q-r-s
letters.myJoin("-",1) //q-r-s

Answer 3

Answer №2

To extract a specific section of an array, you can simply slice it and then manually concatenate the elements.

let fruits = ["apple", "banana", "cherry", "date"];
let selection = fruits.slice(1, 3).join(", ");

Keep in mind that with the slice() method, the end index specified is not included in the selection, so (1, 3) actually selects elements at indexes 1 and 2.

Answer 4

To extract a specific section of an array, you can simply slice it and then manually concatenate the elements.

let fruits = ["apple", "banana", "cherry", "date"];
let selection = fruits.slice(1, 3).join(", ");

Keep in mind that with the slice() method, the end index specified is not included in the selection, so (1, 3) actually selects elements at indexes 1 and 2.

Come together with Array starting from the specified startIndex and ending at the

Answer №1

Answer №2

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